{
  "cveId": "CVE-2026-84380",
  "url": "https://patchblox.com/security/cve/CVE-2026-84380",
  "summary": "CVE-2026-84380 is fixed in python-httpx2 on 1 platform by DEBIAN-CVE-2026-84380 (version 2.12.0-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "python-httpx2: HTTPX2 is a next generation HTTP client for Python",
  "description": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0.",
  "published": "2026-09-02T18:21:29Z",
  "severity": "medium",
  "cvss": 5.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
  "epss": 0.00221,
  "epssPercentile": 0.12759,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "python-httpx2",
      "release": "Debian 14",
      "fixedVersion": "2.12.0-1",
      "fix": "DEBIAN-CVE-2026-84380",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-84380",
      "released": "2026-09-08T02:27:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}